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  If your build requires a custom <a href="http://ant.apache.org/manual/running.html#envvars">ANT_OPTS</a>,
  specify it here.  Typically this may be used to specify java memory limits to use, for example <code>-Xmx512m</code>.
  Note that other Ant options (such as <tt>-lib</tt>) should go to the "Ant targets" field.  
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